Heat-regulator for ovens.



. PATENTED JUNE 18, 1907.

J. P. FARMER. HEAT REGULATOR FOR OVENS.v

APPLICATION FILED JAN.!), 1906.

WITNESSES: jNVE/VTOR.

A TTOR/VE Y5 STATES "ATENT Fries.

JOHN P. FARMER, OF MONTAVILLA, OREGON.

HEAT-=RseuLATos FOR OVENS.

Specification of Letters Patent.

Patented June 18, 1907.

Application filed January 9, i906. Serial No. 29 5,314.

' regulators for ovens, and it has for its object i so to present a device of this class which shall be very simple in construction and efficient in operation, and which may be readily applied to ovens of various kinds for the purpose of regulating the interior tem erature.

With these and other ends in v1ew, which' will readily appear as the nature of the in-, vention is better understood, the same consists in the improved construction and novel arrangement and combination of parts,'which will be hereinafter fully described and particularly pointed out in the claims.

In the drawings hereto annexed, Figure 1- is a pers ective view showing a simple and pr'eferre form of the invention. Fig. 2 is a horizontal sectional view'showing the ports closed. Fig. 3 is a horizontal sectional viewshowing the ports open. Fig. 4 is a horizontal sectional view illustrating a modified form of the device and showing the ports closed.

Corresponding parts in the several figures are indicated throughout by similar characters of reference. I

The oven casing, a portion of which is shown at 1, is provided with one or more ports or openings, as 2, 2. A single port of suitable shape and dimensions may be found suflicient, but as a rule a lurality of smaller ports will be arranged in a inement with each other, as shown. Through these ports, the interior of the oven is in communication with the outer atmosphere.

A valve or closure'for the ports 2 2 is provided, the same consisting of a thermostat bar (J, which in the present instance is composed of two members 3 and 4, which will expand unequally under the influence of heat, such as brass and iron, said members being riveted or otherwise suitably secured together. This compound bar is secured upon the oven plate, as by means of bolts 5, 5, in such a position that at normal temperature the ports 2, 2 will be covered thereby, the material of greater expansion, as 3, being preferably placed adjacent to the ports. At

normal tem erature the thermostat bar 0 is straight, an it willconstitute a' tight closure for the ports.

When the temperature of the .oven is raised, the thermostat bar will warpv or buckle in an outward directionfthus gradually and successively uncovering the ports,

permitting the heated air within the oven to be gradually displaced by the cold outer air,

and thus effecting a reduction of the temperature; as the temperature within the oven is reduced, the thermostat bar is restored in the direction of the ports, thus obstructing the passage ofair. t is obvious that by properly constructing the thermostat bar, and by properly locating the same'with relation to the ports, the tem erature within the oven will be automatica ly maintained at a predetermined degree.

Under the modified construction illus trated in Fig. 4 of the drawings, the thermofiortion 6 intermediate the ends thereof, the at extremity of the bar constituting the closure for the ports 2, 2, this form of the device Willbe found more sensitive, owing to the greater length of material in the thermostat bar.

Heat regulators have heretofore been de vised in which valves or dampers have been operated by thermostats; bythe present invention, all unnecessary complications are dispensed with, the single compensating thermostat serving also to form a valve or damper for the ports.

Having thus described the invention, what is claimed is i 1. The combination of a fiat ported wall, with a thermostat arranged to open and close the ports thereof, said thermostat comprising a pair of metal strips of different co-efficients of expansion, the strip having the greater co-eflicient'being arranged next the wall and having a fiat portion adapted to open and close the ports, and rivets for securing the strips together which have countersunk heads in the strip controllingthe ports.

2. The combination of a wall provided having the greater coefficient next the wa and having flat end portions arranged with stat bar is provided with a curved or bulging their longitudinal dimensions alining and I flush with the surface of the said flat porconnected by a laterally extending bulge, one 1 tion which contacts with the ported Wall.

of the said flat portions forming a single In testimony that I claim the foregoing as valve for covering and uncovering the several my own, I have hereto aflixed my signature 5 poll'ts, rivets-extending through the fiat and in the presence of two Witnesses.

bu ged portions for securing the strips together, and means for securing the other flat JOHN R T portions to the said Wall, the said rivets eX- Witnesses: tending through the fiat portion forming the W. W. MCINTOSH, 10 valve having their ends countersunk and S. KAFKA. 

